This guide is a work-in-progress, intended for level 60's to be able to haul alts/low level friends through all the quests for a particular dungeon.The level listed is the minimum level they need in order to pick up all the quests for the dungeon. It currently has a horde-oriented slant, since that's what I play. =)
RAGEFIRE CHASM - lvl 11+
* In the Undercity pick up "The Power to Destroy..." from Varimathras in the throne room.
* In Thunderbluff pick up "Testing an Enemy's Strength" and "Searching for the Lost Satchel" from Rahauro on Elder Rise.
* In Orgrimmar, speak with Thrall and he will give you the first step of "Hidden Enemies" and will ask you to fetch a
Lieutenant's Insignia from Skull Rock (near the Zepplin tower in Durotar). Once you finish that, there is some dialog, and you
should be ready to hit the dungeon for the 3rd step of "Hidden Enemies"
WAILING CAVERNS - lvl 18+
* To prep for this you must complete "The Barrens Oases" chain (which starts around level10) and leads up to you speaking to Nara Wildmane in Tunderbluff to get "Leaders of the Fang"
* While in Thunderbluff pick up "Serpentbloom" from Apothecary Zamah in the Spirit Rise cave.
* In Ratchet pick up "Smart Drinks" and "Trouble at the Docks" from the goblins.
* When heading to Wailing Caverns, we will pick up "Deviate Hides" from the secret cavern/face above wailing caverns.
SHADOWFANG KEEP - lvl 18+
* Get "The Book of Ur" from Keeper Bel'dugur in the Apothecarium in Undercity.
* Get "Deathstalkers in Shadowfang" from High Executor Hadrec at the Sepulcher
* Get "Arugal Must Die" from Dalar Dawnweaver at the Sepulcher.